Are you talking about the colossus in the de_wanda map? I don't know the right term for what it is (aside from map element), but it's not a ragdoll.
I made a quick search, but didn't find any ragdolls or props.
If anything, you can inflate another ragdoll (or get a prop resizer) and make your own colossal creature.
Link managed to defeat his dark side, only for a greater evil to appear...
---I so want a boss fight like this in Zelda Wii, but I doubt it will happen.